[1] Leiden Univ, Med Ctr, Willem Alexander Childrens Hosp, Dept Pediat, NL-2300 RC Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Med Eth & Hlth Law, Leiden, Netherlands
[3] Univ Amsterdam, Dept Hematol, Amsterdam UMC, Amsterdam, Netherlands
[4] Sanquin Res, Dept Blood Cell Res, Amsterdam, Netherlands
[5] HAGA Hosp, Dept Hematol, The Hague, Netherlands
[6] Emma Childrens Hosp, Acad Med Ctr, Dept Pediat Hematol, Amsterdam, Netherlands
[7] Univ Med Ctr Rotterdam, Erasmus MC Sophia Childrens Hosp, Dept Pediat Hematol & Oncol, Rotterdam, Netherlands